The Bubbleator was a large, bubble-shaped hydraulic elevator with transparent acrylic glass walls operated from an elevated chair built for the 1962 World's Fair in Seattle. These transparent walls gave the illusion of looking through an actual 'soap bubble' by refracting light to obtain a rainbow-like effect for the riders inside. It lifted 100 passengers at a time up one floor through a structure of interlocking aluminum cubes to the "World of Tomorrow" exhibit. The exhibit offered fairgoers a startling glimpse of the future through an elaborate multimedia presentation featuring images projected onto the translucent surfaces of thousands of cubed structures, described by designers as "suspended nebulae--much like a floating city." Ominous narration spoke of the day's most pressing concerns--the ever-present threat of nuclear war chief among them--and comforted visitors with the promises of a better life through the scientific advances and technological innovations of the future. The visions and voices telling the story repeated on an elaborate schedule every two minutes and forty seconds, meeting each new group as they moved along the winding ramp. Never before had an exhibit combined the use of staging, timing and electronics on as large a scale.